#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair
#define mt make_tuple
#define ll long long
#define pii pair<int,int>
#define tii tuple <int,int,int>
#define N 100005
#define mod 2000003
#define X first
#define Y second
#define eps 0.0000000001
#define all(x) x.begin(),x.end()
#define tot(x) x+1,x+n+1
using namespace std;
ll sol, a, b, i, p, x, n, zece, y, zero;
void rec(ll b, ll zece, ll p, ll x) {
    if(b == 0)
        return;

    y = max(10 - (b / (zece / 10)) - 1, zero);
    sol -= y * (p/x);
    rec(b % (zece / 10), zece / 10, p / x, x);
}
int main() {
    cin.sync_with_stdio(0);
    cout.sync_with_stdio(0);
    cin >> a >> b;

    if(a >= 10) {
        cout << 0;
        return 0;
    }

    if(b <= 9) {
        cout << b - a;
        return 0;
    }

    sol = 10 - a;
    x = sol;
    b--;
    n = log10(b ) + 1;
    p = x * x;
    zece = 10;

    for(i = 2; i <= n; i++) {
        zece *= 10;
        sol += p;
        p *= x;
    }
    p/=x;
    rec(b, zece, p , x);
    cout << sol;
    return 0;
}